Non-interference signal transmitter



June 1931- c. M. SACKMAN 1,812,173

NONINTERFERENQE SIGNAL TRANSMITTER v FiledDec. 21, 1925 Q SheetS-Sheet 1 gwvankot 4 lac/cm June 30,. 1931. c. M. SACKMAN 1,812,173

NONINTEREERENCE SIGNAL TRANSMITTER Filed Dec. 21, 1 9 Sheets-Sheet 2 INSULATION gmmom Sat/b72072 TM attoznaga June 30, 1931. 1 c. M. SACKMAN NONINTERFERENCE SIGNAL TRANSMITTER Filed Dec,

INSULATION 9 Sheets-Sheet 4 jwuenfot Cf/ZASackma/z June 30, 1931. c. M. SACKMAN 1,812,173

I NONINTERFERENCE SIGNAL TRANSMITTER Filed Dec. 21,- 1925 9' Sheets-Sheet 5 INSULATION g Mentor mummy June 30, 1931.

v C. M.

SACKMAN NONINTERFERENGE SIGNAL TRANSMITTER Filed 9 Sheets-Sheet 6- Saab/2a wmwufi June 30,1931. Q MSACKMAN 1,812,173

NONINTERFERENCE SIGNAL TRANSMITTER Filed Dec. 21, 1925 9 Sheets-Sheet 7 M INSULATION INSULATION. I I

June 30, 1931.

c M. sA'c N NONINTERFERENCE SIGNAL TRANSMITTER 9 Sheets-Sheet 8 Filed Dec. 21, 1925 box has completed its round of signal ait'er I the I until the first boxcompletesthe transmissiontrim PAnArvIo'n'n'r Finn imam smn snme {com-Pliny, ion (rumi ant; onto, .A

, conronn'rioriior e u. Q

meani g es -lamest IGNAL TRANSMITTER A plication filed Decembenm,:13255 sensing 76;.929.

. This invention r'elatesto electric signalling" apparatuscommorily known as signal transmitters such as are .usedfforiire alarm signals, in which a break wheelie employed to transmit a code signal .a predetermined number oftim'es, and more particularly to a signalling apparatus of this characterso or; ganized andcon struc-ted that two 0rm0reating train and to prevent -.said;spr in'g-from 60 transmitters, in the same circuit, may be set in operation at approximately the same without interference,- the'lfirst box operated ta king the line "and transmitting. its. signal,

whi-le the v otl' ier box or. boxes subsequently set in operation willfcontinue to run idly With.- out transmitting, until such time as the first Whichthe other box or boxes subsequently operated, will successively 'take the line as v they assume position to transm t .a 1complete round of signals, and will, in turn, transmit a-coniplete round of si'gnalsipreferabl -y four.

complete signals:

The objectsfio'f the invention'are to prov-ide a signal transmitter of such construc tion that Wherea number of such signal trans mitters are used in thejsame circuit or loop initter isf stillin operation, will be automatically prevented from titansnntting ts s gnal,

gear train of the second box. running idly of its signal-and until such timethereafter as the second box assumes a position to trans- 'mit 'the desired number of frounds when it' will automatically take the ,line andtransmit a complete signal.

A, further ob 'ect about the same-time, only one box will; take the'l-in'e .to send its signal, whilethe actuating trains of the remainder ofthe boxeswill plete round of5'signa1s; I v

I of the improvement is to so construct the box that regardless .of the.- number of boxes which may be pulled :at son A further object is to preventa subse I PAT T, j v '1 l f j amazes; M. sAcKMAN,foFornvnnnn'nfonro,AssIGNoR; BY i/msnn ASSIGNMENTS, inojjf.

quently operated, box from takingv the line andco nmenicing the transmission o fits sigh ntil the mechanism. thereof-is in such i pos t on astfo transmitacompletie round of signals. s 4 A still; further object of theinventionis to 1 which furnishes motive 1 power ato the aet unwinding beyonda point where itwill properly actuate the train. i I I Another object of the signal transmitters-are located, that inlthe box will function properly if pulled; the cir prevent oVerWinding of the. motor 1 spring 3 l I invention is me k-T is arrange the c1rcu1t,;1 nwhicha pluralityfof-j 1 r cuit comprising a loop which maybe cong" nectedto one side only o-f the-battery in ea j '3 I of a break in the line, each box entrails mitter being connected to theloop, the oppo-= I site s de of the battery being arranged .tojbez.

. grounded and eachfbox ,being'prov-ided with a g ou ed o ne on, whereby acom'p'flete circuit is made froin thebatteryaroundlone slde of the loop toeach box and then through. u

the ground tothe other side ofthe battery. I

An embodiment of the inventiOhthuS ysiet mechanismremove'dfrom the casing; ,F g. 3,, a topplani viewof the same; 2- ,Fig; 4, a,section onthe line 44-4, Fig. 3 i

2, a'rear'elevationof thetmnsmitting j F ig, 5, a section on the linef55,Fig.

1* g. 6,.a section on the hne-6 6,I*ig. 5; "Fig". .7, a sect on onthe line 77,

p 8, a sectionon theline showing the pull handle for, trippinghth .ac-gtuating'mechanlsm'; n I F ggta detail 'perspe'ctllve view of the triggergbearing; jl 1 I? g.g1Q,-.-a detail perspective view}- of the tr15zger; :j v l Fig. 11, apjerspective v ewofthdstop armw and associated mechanism; I V

'forthin general-terms, is illustratedin the accompanying drawingsin whichq fi l n Figure 1 isa front elevation. of the casin'g' I enclosing the transmitting m-echanism- {to 'whichthe invention pertains; 1

so i Fig. 12, a section on the line 1212, Fig. 11

Fig. 13, a detail perspective view of the lever which controls the armature;

Fig. 14, a detail of the bracket upon which said lever is mounted;

Fig. 15, a detail sectional view of the spring case and winding mechanism;

.Fig. 16, a section on the line 1616, Fig. 15

Fig. 17, a detail perspective view of the rocker shaft and arm controlling the make and break devices;

Fig. 18, a detail view of the shoe carried by said arm;

Fig. 19, a top plan view of the casing in which the transmitting mechanism is housed, showing the telegraph key and other mechanism thereon;

Fi 20, a bottom plan view of the same;

Fig. 21, a fragmentary side elevation of the upper portion of the casing, showing the telegraph key,

Fig. 22, a section on the line 2222, Fig. 19

Fig. 23, a section on the line Fig. 19

Fig. 24, a section on the line 24-24, Fig. 19

Fig. 25, a diagrammatic view of the wiring in each box; and

Fig. 26, a. diagrammatic view of the wiring of the circuit.

Similar numerals refer to similar parts throughout the drawings.

The transmitter mechanism is arranged to be housed within a casing 27 adapted to be secured within the usual shell or box as by screws or the like passed through the ears 28 formed upon the rear side of the casing.

The transmitter mechanism is illustrated as supported upon the plate 29 which may be connected to the cover plate 30, of the casing, as by screws 32 or the like. A rear plate 33, of the shape best shown in Fig. 2, is spaced from the plate 29, as by the posts 34, to which said plate is connected as by screws 35.

Motive power is furnished for the actuating train of the transmitting mechanism by a helical spring 36 (Figs. 5 and 15) fastened at its inner end to the main drive shaft 37 and at its outer end to the spring drum 33. V

The main driving gear 39 may he formed integrally upon the spring drum, at the rear edge portion thereof and an annular shouldered portion 40 is provided around the forward edge of the drum and receives the cover plate 41 which is connected thereto as by screws 42.

The outer portion of the shaft 37 is reduced and the collar 43 is pinned thereto, the inner end of said collar having a pinion 44 formed thereon and spaced from the shoul dered portion 45 of the shaft.

A similar pinion 46 is fixed to the spring drum cover plate 41 in any suitable manner, such as the tubular extension 47, said pinions meshing with the gears 48 and 49 respectively, which are journaled upon a stud shaft 50 mounted in the front plate 29.

A concentric, arcuate groove 51 (Fig. 16) is formed in the inner face of the gear 48 and a stud 52 is carried by the gear 49 and arranged to travel in said groove.

A winding knob 53 (Fig. 15) is fixed upon the outer end of the shaft 37 and a ratchet 54 is fixed upon the inner end portion of said shaft and arranged to be engaged by the pawl 55 (Fig. 4) pivoted upon the back plate and normally held in mesh with the ratchet teeth by means of a spring 56.

In winding the spring, the knob 53 is turned in the direction of the arrow shown in Fig. 1. The spring drum 38 remains stationary during this winding operation, since the gear 39 thereon is in mesh with all the actuating train, which will be hereinafter cle-v scribed, while the inner end of the spring 36 is wound around the shaft 37 as the same is rotated.

As the spring drum does not rotate during this winding operation, the pinion 46 thereon, meshing with the gear 49, holds said gear stationary, the gear 48 being rotated in the direction of the arrow in Fig. 16, by means of the pinion 44 upon the winding shaft.

As the end of the groove 51 indicated at 57 (Fig. 16), engages the pin 52, further turning of the shaft 37 will be prevented, thus preventing the spring from being wound too tightly.

lVhen the actuating train is set in motion, as will be later described, the shaft 37 re mains stationary, while the spring drum rotates in the direction of the arrow in Fig. and through the pinion 46 rotates the gear 49 in the direction of the arrow shown in Fig. 5, while the gear 48 is held stationary.

As the pin 32, carried by the gear 49, engages the end of the groove 51 indicated at 58 (Fig. 16) further movement of the spring drum is stopped, thus preventing the spring from unwinding beyond a point where it will function properly to drive the actuating train.

The brake wheel shaft 59 (Figs. 4 and 7) is journaled through the front and back plates 29 and 33 respectively and has a pinion 60 formed thereon and meshing with the drive gear 39, upon the spring drum.

The escapement drive gear 61 is fixed upon the shaft 59 and meshes with the pinion 62 upon the escapement gear shaft 63, which is also ournaled in the front and back plates, the escapement gear 64 being mounted thereon.

The escapement shaft 65 is journaled be r 2 and Q5)'-is 'fixed upon the rear 'erid portion I end, as-at72, tothe b'aokplate, at a point adv .jacent to thehreak wheel andis provided, on V 7 to engage {the m'ake and breakspring 76,

A r'ockershaft 80' (Eigsp5jand '17 is jourm p free end normally located in'th'e 'POSltiOII-Q S 0f the break YWheel sfhatt 59 and is provided with teeth upon its periphery, suitably Spaced. in groups corresponding to the' -c liar-;

acteristicsignal ofthe box; 7

The first tooth, indicated ait 70',is.of gre'ater Width than the remaining teeth, {as (best shown in'FigpQq The rotation ofthe-break Wheel'is in the direction of th 'elarrow show-n3 inFiEgSZx-J i The signallever 71ispivot'e'd at its upper the side toward thebreak Wheel,vvith atooth 7 3for engagement Withtheteeth uponf the break Wheel. The lower free-end ofthesigQ nal lever is beveled as shofvvn at 74; j p

A bracket 75 is mounted upon the back plate and i 'supports "the niake 'and'" break springs-76'and7 7 and the shun't' contact spring 78, all' of ivhich are-insulatedjfrom each other is carried by the'signal lever and arranged naledbetweength'e frontand backplates adjacentIto the spring; drum and providedivithl a curved arm' 81 having" a -beveled shoe 82 at-its free end for normal engagement with either of the diametrically" opposite notches r 83 in the an u ar shoulder 10 'of theqdrurn, a] c spring 84 being provided for normallyhold-f 81 -in'this position, as V p p w- '1 A. at'122upon' the bracket 117,;the rearwardly 1- extending free end of the lever 121 being adapted, to engage thepin123 Fig.- 7) upon; the forwardly extending finger 1 24 ofthe;

- shownin Fig.5.

, carries a cup 86,1o f suitable insulation mate mg, the" curved arm" I. The mam 85 (Figs; fwd 25 is xed to the outer'end of the roolrer'shaft and rial containing mercury, as indicatedatfSZ, for I normally immersing the contact ends of the springs .76; 7 and' ZS when the lift armj'is in. the. normal raised position, as shown 'in' h n inclined surfaoe 88 forine d' upon-the lift arm for normalenga'gement wlth the bev-f eled lower end of the signal arm in: order to hold the armf in p'osition'to close the circuit through the Contact springs I 76,". 7 Ta'nd 78, When'the-armiis' in the nor1nalposition An insulation block 89 is mounted upon the lli ft a r-m -and carries spring --arm'i90 to which is attached a sp ac'edpair or Contact pins 91, forming-a part of the groundswitch and adapted to close-the ground circuit when said arm islo-Wered,thecontact pins 91 being immersed in the mercury indicated at 92 in the Cups-93, which are" carried infthe-insul'a- I tion block 94. t 1

' A magnet is providedin the device and comprises a pair'of coils95 housed in casings "96- (Figs. 2 to?) of, suitableinsulationirnaterial and'grou'nded'. upon the front plate 29 point beyond,-

and extending backward to a the plane of the back plate; 1

-The armature '97 (Fig: 2):- is in the torn]; o-f a bar arranged tobeengaged by bothcoils.

otthe niagnet and is oarried upon a lever :98'

pivoted between the ears of-the hloek 99, upon p the back .plate, as by the pin '1;O0 a springlOl (Fig. being provided tor normally holding the armature in retraoted position and en agingthe lu g'lO2,.upon"the op'positeend of the" lever, with the pin 103upon the signal arm, A finger 104 is provided upon'the'end of the armature lever --adjacent to the armature 1 and-arranged to hey'normally engaged bye lu 105 upon-the arm 106 of stoplever 1O wh ioh is pivoted as,atj108ft-o'the'post 109,- mounted" upon the front plate 29; 1 A spring 110'is conneotedlto the arm'llOG asbythe pin ll land to a pin 112 upon" back 7 plate 32" for normally holding the lever initheposition shown in' F-ig. 7,"'the lug 1 13 Iupon the free end of the'lever being engaged in onefof the diametrically opposite. notches with thedepending, tapered lng 118 atits illustrated in. l?ig; 11, the spring 1 19 being i V providedfortendingl'to urge said *liigll-Sirito drum; I

' engagement Withthe periphery oi? the spring An upvvardl y; curved 120 i's v providedi'upon thelever 114 'for engage f ment With the lever'121, 'W'hlCll lS pivoted as armature lever-r- V andsur-rounding the'plunger.

f The projecting end ofgthfe plunger'engages' "the"trigge'r-'l29 which-ispivoted,atitsupper of the triggerbearing 1-32. 1 Apul-l handle 133 is: attached to the trigger as shown in; Fig. 8, 'By dep'r'e'ssing this handle, the trig-= v g'er isr ckedjupon-its pivot 130, moving the; 'spring pres'sed plunger inward or rearward V 'again'st'the pressure'of the sp ing nd displ'acing'the stopleverl07, 'j

jThe' wiring o t each transmitter is, ive'rysimilar and is illustrated 'diagraininatieally 7 in Fig. 25. Three. "terminals: d'e'signate'd' at 184, 135- and 136 a're' carried in aminsma,

endportiomas'at 1-30,'betvveen the ears 131 is) v tion bloek 137 (Figs. 2 to"6)inountedupon the upperp'orti onof the 'jlate i id The '-15e'r-- minal ;1:.34.is *connectedfasy a wire 1 88" with i one of 'the'rnercury' cups the ether 01f :said

lieyf mercury cups being connected by a wire 139 with the terminal 135.

A wire 140, also leads from the terminal 135 to one of the magnet coils 95, which is connected by a wire 141 with the other magnet coil 95, a wire 142 leading from said last named magnet coil to the contact spring 77.

The contact spring'76 is connected by a wire 143 with the terminal 136 and the shunt spring contact 78 is connected, by a wire 144 with the terminal 135.

The top plate 145, (Figs. 1, 19 and 20), is formed of suitable insulation material and arranged to be attached to the top of the housing 27, as by the screws 146. The under side of this top plate is recess-ed as shown at 147, and the spring contact arms 148, 149, and 150 arranged to engage the terminals 134, 135 and 136 respectively.

These spring contacts are connected to the plate, at their inner ends, by the screws 151, 152 and 153 respectively, the forward, free end of each arm carrying a tapered stud 154 (Fig. 24) arranged to engage a similar socket in the corresponding terminal, screws 155 being preferably provided for drawing each stud tightly into its respective socket.

Three binding posts, designated at 156, 157 and 158, are mounted in the top plate for connecting the signal box in the circuit or loop. The post 156 is connected, as by the wire 159, with the contact spring 148 and the binding post 158 is connected, in like manner as by a wire 160, to the contact spring 156.

A telegraph key 180 and sounder 196, of usual construction, are preferably mounted upon the top plate, the wire 161 leading from the binding post 1.57 through the telegraph instrument and then to the contact spring 149.

A block 162 (Fig. 24), of suitable insulation material, is mounted upon the top plate, over the spring contacts above described, and provided with a pair of metal sockets 163, electrically connected to the contact springs 149 and 150, and adapted to receive the fingers 164 of the testing stud 165, the handle 166 of which is of such length that the door 167 (Fig. 19) of the shell can not be closed with the plug in the shortcircuiting position shown in said figure.

In the ordinary or usual circuit, as shown in Figs. 25 and 26, for operating the boxes as non-interference transmitters, the loo-p or circuit is represented by a wire 168, normally connected at opposite ends to each side of the battery 170, located at the fire department headquarters, as shown in diagram in Fig. 26. This loop or circuit wire is broken at each transmitter or box, one side of the break being connected to the post 157 and the other side thereof to the post 158.

The post 156 is connected, as by the wire 169, to the ground in order to provide a ground circuit to be used for operating the boxes in the event there is an accidental break in the loop or circuit 168, on the side of the circuit connected to the binding post 157.

The circuit of the entire system, as illustrated diagrammatically in Fig. 26, includes the wire 168, leading from the positive side of the battery through any suitable and usual headquarters instruments, such as the gong or alarm, indicated at 181, and the register, indicated at 182, and then to each of the boxes or transmitters in the system, indicated generally at B in said figure.

After communicating with each of the boxes or transmitters, the wire 168 is connected with the switch blade 171, normally contacting with the contact point183, which is connected, as by the wire 184, with the negative side of the battery. A contact point 185 is spaced from the cont-act 183, and arranged to be engaged by the switch blade 171, when the circuit is grounded, as will be later described. This contact 185 is connected to the loop adjacent to the gong and register.

A second switch blade 186 is movable with and insulated from the switch blade 171, and arranged to make cont-act with the contact points 187 and 188, when the blade 171 contacts with the point 185, but to be normally spaced from said contact points 187 and 188, as illustrated in Fig. 26. r

The contact 187 is connected, as by the wire 173, with the ground, and the contact 188 is connected, as by the wire 189, with the negative side of the battery 170. Thus the normal circuit in the system is, as shown in Fig. 26, from the positive side of the battery 170, through the gong and register, through all of the boxes or transmitters, through switch blade 171, contact 183, and wire 184, to the negative side of the battery 17 0.

The normal circuit through each box, when the same is in the inoperative condition, is from the loop 168 through post 158, wire 160, spring contact 150, contact point 136, wire 143, contact spring 76, mercury 87, contact spring 78, shunting out coils 95, through wire 144, contact 135, spring contact 149, wire 195, telegraph sounder spools 196, telegraph key 180, wire 197, post 157 and back to loop 168.

The circuit is thus normally closed through each box, the coils 95 thereof being shunted out of the box circuit, and the entire loop circuit for the system is normally kept under test.

In the operation of a box, to transmit its signal to headquarters, the lever 133, (Figs. 7 and 8) is rocked downward, pushing the plunger 125 inward and rocking the starting lever 107, upon its pivot 108, withdrawing the lug 113 of the starting lever from engagement with the upper notch 83 of the spring casing.

As the spring casing is thus released it will commence to rotate in the direction of the arrow in Fig. 5, immediately displacing the shoe 82, from the lower notch 83 of the spring;

, casing and rocking'the curvedarm 81 down- 8 v g '1 nal arm, moving 'the'spring contact 76 into Fi The shaft '80i's thus rocked and the arm85,

. (-Figs. 2and is swung doWnward, lower-" ing the mercury cup 86 and breaking the mercury contact between the -spring contactsward; 7 V

7 6 and 78,'thusbreaking the shunt around the coils 95,]and permitting the current to pass throughgsaidcoils.

At the same time it willbe seen that'the V lowering of the arm 85 "lowers the contact pins 91 into the' mercu'ry 92, in the cups 93,1. 7 eclosing the' gr'oundswitch; This normallyi has no efl:ect, but is a necessary feature for operating the box ineventthe loop or circuit 168' is accidentally broken, will be later described;

. It will thus be seen that the'circu'it is closed from the loop 168 throughthe wire 1 13,0 11- tacts 76' and 77,-wire 142, coils 95, w re andback to" the' loop 168;

i The tapered 111 1 s of 'theilever "114 will shortly thereafter ride "down into the upper n'otch 88 of the spring casing, the'curved tall portion 120 of said lever rocking the arm-121 which through the'pin 123 on the lug 124; of

' the armature lever98, will move the armature into the magnetic held of the coils-95". s

. The rotation-of the spring drhm will cause the signal Wheel 69 t0- ro'tate, andthe'long I tooth 7 0 thereon willhav'e engaged the'tooth 73 of the signalarmwhile-thearmature cong' trolling lever 114 and'arm 121 are holding the armature in the magnetic fi eldlof the magnets f 95, thus closing the circuit through thespring' contacts? 6 and 7 7, the finger 79 upon the signalarm holding the contact 76 against the contact 77, wh

ergized.

' The coils being energized attractlthe i armature 97 and-hold the armatureagainst the coils, rocking the lever 98 upon its pivot 100' and releasing the pin'103, upon the'sig-j 'na-l arm7 1, from -engagementwithrthe lug? 102 upon the lever'98:

As the signal wheel 69 rotates, the teeth thereon will engage the tooth" 7 3 uponthe signalarm 71. Asthis tooth on the signal arm rides into the depression ofeach tooth 1011 the signal wheel, the circuit is momentarily brokeny the' impu'lses transmitting the signal through the loop 168to=the headquarters in struments." v At each breakinthe circuit it will be seen 7 that the coils '95 are momentarily de-energized and thus the coils 95'will not themselves hold the armature down.) During these breaks in the circfuit,' the armature-is held down by the'end ofthepin 103 -'upon the signal arm engaging the'e'nd-of'the lug 102 on the lever :98, thus holding the armature within the range of -the ma nets until the circuit is again completed and thema nets ire-energized by the tooth 73 of thesigna J arm and shaft 59,21

erehy the coils 95 will' be enboafthelu thereof will have released the lug 104 up n thearmature lever, pennit ting the spring 101 to throw the A armature contactwiththe contact 77.

It W111 be "seen, of"course,1that the" signal row-on, Fig.125, by theiunwinding o f -tlie spring 36 andthroughthegear- 39',pinion 60 the spring casing'completes one-halfot' a revolution, the mechanlsmwlll have tom '0 four complete-repet tions of the- 'sig' pleted nal. r

This permitsthe lug 1130f the stop lever casing, stoppin-g'the rotation of the spring clined surface 88 of thfe arm 85 will move the i rmback to the inoperative position, V permit-ting the 111g 02 on the armature lever Pin-103on th sign ms;

i-Assu'mi-ng that there is another box operat 111;; when a box *is pullechthe spring casing The armature; lever 98 being held down" l upon-the coils at thistime,'the lug 1104 on said lever is in such posi tion that thelug 105 i on the-stop lever 107 can move overjthesa-me;

at i ,1

of the second box will commence to rotate. as

above described." Thelever 107Ihaving been i swung uponits pivot, by the pulling of the: f v

lever out 'of rangeof the magnets 95,whilejr v Immediately afterthis,"the -tapered lug i 118ofthearmaturecontrolling'lever 114::Wl11" ridedown into'thenot'ch' 83fofthe spring casing, the*tail 120 of said lever rocking the arm; "121, which-through the pin 123,011 the 1 lug 124 of the'armature lever 98,will move Zth'e armatureinto the-magneticfield of the, I

coils 9551151; asjthe'long' 'tooth"ofth-e signalfl vwheel engages thetooth on the signal arm." As the 'vcurre'nt isbeing rapidly brokeniby a the operation of the first box, the coils95 in the second box will not be energized, per-'' Init't-ingthe spring 101 to throw thearmature vlever out or the field of the coils 95,,fthe

1020f theariiiature lever engaging the pin. v

' 1030f the signal arm ancl thusholding the signal arm against movement preventing the 0 second. hexfrom'sencling its signahaiid holdingthe? eireuitclosed :thrmjiglh contacts '76 Wheel 69 is rotated, in'the clirection of the at: x

in) i and 77, permitting the first box to complete its signal.

Itwill be seen that the rotation of the spring casing will have immediately dis placed the shoe 82 from the lower notch 83, in the spring casing, rocking the curved arm 81 downward and through the shaft the arm 85 will be rocked downward, lowering the mercury cup 86 away from the spring contacts 76, 77 and 78 and closing the ground switch 9193 which, as above described, has no effect excepting when the circuit is broken and the emergency switch 171186, at head quarters, is closed as above described.

The parts will remain in this position until the spring casing completes one-half of a revolution, at which time the armature lever being still held out of the field of the coils, the end of the lug 104 thereon engaging the end of the lug 105 on the stop lever 107 will prevent the lug 113 on the other end of the stop lever from entering the notch 83, which permits the spring casing to continue to retate.

Immediately after the lug 113 passes the notch 83, the tapered lug 118 of the lever 114 will ride down into the upper notch 83 of the spring casing, the curved tail portion 120 of said lever rocking the arm 121 which through the pin 123 on the lug 124 of the armature arm 98, will move the armature into the field of the magnets 95.

If the circuit is still being broken by the operation of another box as the armature of the second box is moved into the field of its magnets 95, it will be seen that the magnets in the second box will not be energized and as the tapered lug 118 of the lever 114 immediately rides out of the notch 83 of the spring casing, the arm 121 will immediately release the armature lever while the tooth on the signal lever is engaged by the long tooth 7 0 of the signal wheel, permitting the spring 101 to throw the armature back out of range of the magnets and again hold the signal arm inoperative as above described.

Assuming, however, that the first box has completed a signal and returned to inoperative position, it will be seen that as the armature of the second box is thus momentarily moved into range of its magnets, the same being thus energized, by the closing of the circuit in the first box, will attract the armature and hold it, releasing the pin 103 of the signal arm from engagement with the lug 102 of the armature lever, permitting the second box to transmit its signal in the manner above described for the first box.

If one box is operating and another box is pulled while the code wheel of the first box is travelling the long distance separating the last tooth of the series and the wide tooth 70, it will be seen that the spring casing of the second box will commence to rotate as soon as the box is pulled. The lever 107 will have swung upon its pivot upon the pulling of the box, and the lug of said lever will have rel ased the lug 104 upon the armature lever, whereupon the spring 101throws the armature lever out of range of the magnets 95, the lug 102 upon the other end of the armature lever engaging the pin 103 upon the signal lever and holding the signal lever against movement, holding the circuit of said second box closed through the contacts 76 and 77.

The tapered lug 118 on the armature controlling lever 114, of the second box, will immediately ride down into the notch 83 of the spring casing, the tail of said lever rocking the arm 121, which, through the pin 123, on the lug 124 of the armature lever 98, will move the armature into the magnetic field of the coils 95 just as the long tooth of the signal wheel engages the tooth on the signal arm. Since the circuit is broken by the code wheel of the first box travelling the long distance separating the last tooth of the series and the wide tooth 70, the coils 95 in the second box will not be energized, permitting the spring 101 thereof to throw the ar mature lever of said second box out of the field of the coils 95, the lug 102 of said armature lever engaging the pin 103 of the signal arm and thus holding the signal arm against movement, preventing the second box from sending its signal, and holding the circuit closed through the contacts 76 and 77 of the second box, permitting the first box to complete its signal.

After the first box has completed its signal and the parts thereof have returned to the inoperative position, the armature of the second box will be momentarily moved into range of its magnets, as above described, and said magnets being thus energized by the closing of the circuit through the first box, will attract the armature and hold it, releasing the pin 103 of the signal arm from engagement with the lug 102 of the armature lever, permitting the second box to transmit its signal in the manner above explained.

In the event the loop 168 should be broken on the left side of a box, both ends of the loop 168 may be connected to the positive side of the battery, and the negative side of the battery may be grounded to complete the circuit from the box through the ground. This may be accomplished by moving the switch blades 171 and 186, shown in Fig. 26, to the left, the blade 171 breaking the contact at 183 and contacting with the point 185, thus connecting both ends of the loop to the positive side of the battery.

The blade 186 will then contact with the points 187 and 188, grounding the negative side of the battery through the wire 189, contact point 188, blade 186, contact point 187, and wire 173.

Then assuming the box is pulled, as above box without passing 5 box, as the tooth upon the signal armlis en-f gaged by the teeth on the signal wheel, the

described, the circuit will becoinpleted from the unbroken side of the" wire or 10013168, through the wire 143, contacts 76 and 77, Wire 1142, magnets 95, wire 140 to contact 135, then through wire 139, ground; switch 9193 which is closed-when the box is pulled, wire 138, contact'134,-wire 169" to the ground and then through the ground connection 173 to the negative side of the batteryat headquarters,-"completing the circuit through the through thenormal circuit above described. i

It will be obvious that in the o-perationo-f a circuit is continuously opened and closed through thecontacts 76and 77,-thus intermit--- tentlyimaking and breaking the circuit to the register, alarm or otherusual mechanism at apparatus in usual and ordinary' manner.

headquarters, the impulses produced by the box being responded to'by the headquarters I claim z- 1. A non-interfering I a signal wheel, a drumffor rotating the wheel and having a notch in its periphery, means normally urgingthe drum to rotate, a stop lever normally engaging thenotch to hold the drum against rotation, means for disengaging the stop lever from'the notch to permit the drum torotate, signal transmitting mechan1sm ture is'away from the magnet and cooperate ing means upon the stoplever and armature for preventing the stop lever from engaging signal box including the armature lever is tarily moving the armature into the range of 1 the magnet'as the drum starts to rotate and at each rotation thereof, means upon the armaj ture for holding thesignallever inoperative when the armature is away from the magnet and cooperating lugs upon thestoplever and l armature for preventing thestop lever from engaging the notch in the drum when the armatureis out of the "range of the magnet.

I -3. Anon-interfering signal box including a signal Wheel, a drum for rotating the Wheel and having diametric notches in its 7 ery, means normally urging the drum to ro'- tate, a stop lever pivoted intermediateitsends 'and'having a'lug ateach end, o'neof saidi lugs normally engagin'ga notch in the drum 'tohold the drum against rotation, means for moving the stop lever upon its pivot torelease the drum and ipe'rmit'it torotate, signal v transmitting mechanism including a circuit. 35

controlling device anda signal lever for op}: crating the circuit controllingv device, amagnet in the box, an armature lever for themag 7 net, the armature lever being pivoted interme-;

diate itsends, and having a lug at each end,

engage the other lug upon the stop lever,

means'for urging the armature "lever out of- V V range of the magnet, can armature controlling '1 a levercooperating with either ofthe notches in the drum for momentarily moving the armature lever into the range of'the magnet as 90 I one lug'upon the armaturelever 'arranged'to I I the drum starts to rotate, the other one of-the lugs upon the armature lever holdingthe'sig nal lever inoperative when the armature le-j ver is away from the magnet,the cooperating lugs upon the stop lever and armaturelever, preventing the" other lug upon the stoplever from engaging either notch in the drum when out of rangeof the mag-' net. V p In testimony that I claim the above, I have hereunto subscribed my name.

the notch in the drum'when the armature is .7 I i but of the range of the magnet.

' 2, A n'on interferingislgnal a si'gnalwheel, a drum forrotating the Wheel box including 1 and having a notch in its periphery,means Y normally urging the drumto rotate, a stop lever normally engaging thenotch to hold the drum against rotation,means fordisengaging i the stop lever from the notch to permit the drum to rotate, signal transmitting mechanism including acircuit controlling device and a p signal lever for operating the circuit controlling device adapted to be operated by the sigcnaliwheel, a magnet in the box, an armature 7' I for themagnet,means forurging the armature I V out of range of the magnet, an armature controlling lever cooperating with the notch in u the drum and having a curved end, and a lever engaging said curved end, for momenoHA-RLEsM. SACKMANXY r I I r y no so 1 j 

